The euro's 14-day relative strength index versus the dollar weakened to 28.8 today, the lowest level since October 3. A reading below 30 signals that an asset may be oversold and due to reverse direction, though it could also signal a re-evaluation is taking place.
The Dollar Index, which IntercontinentalExchange uses to track the US currency against those of six trading partners, rose 0.6 per cent to 80.706 and touched 80.726, the highest since January 12.
Stocks in Europe and on Wall Street has both dropped as euro worries fill the void in the absence of any major corporate news.
The Stoxx 600 plunged 2.1 per cent to 232.44 at the close. It has shed 16 per cent so far this year. In London, the FTSE 100 ended 2.25 per cent lower.
Investors had little to cheer about in New York either. The Dow Jones Industrial Average was 0.83 per cent lower shortly after midday. The Standard & Poor's 500 lost 0.93 per cent. The Nasdaq fell 1.53 per cent.
Eight of 10 S&P 500 sectors were down, with energy leading the way. The S&P 500 fell below its 50-day moving average, which may be a portent of more losses.
Contributing to the market's malaise today was a drop in commodities prices, partially linked to the dimming global economic outlook and also the strength of the US dollar. Oil and gold were lower.
Oil bulls got little help if they were hoping for a cut in Opec output. In Vienna, the Organisation of the Petroleum Exporting Countries agreed on a target of 30 million barrels daily, ratifying current production near three-year highs.
But commodities aren't about to reset the market's focus.
"The main issue right now is the complete, absolute failure of the European Union to come to any kind of solution. They're back to where they started from," Jeffrey Sica, president and chief investment officer at SICA Wealth Management in Morristown, New Jersey, told Reuters.